IS 10242 ( Part 2/Set 4 ) : 1993 ( Reaffirmed 2004 ) Indian Standard ELECTRICAL INSTALLATIONS SPECIFICATION PART Section 4 Electric 2 SYSTEM DESIGN Steering Gear and Electrohydraulic IN SHIPS - UDC 629'12'066 : 621'316'174 : 629'12'014'5 0 BIS 1993 BUREAU MANAK OF BHAVAN, INDIAN 9 BAHADUR DELHI STANDARDS SHAH 110002 ZAPAR MARG NEW November 1993 Price Group 2 Electrical Equipment and Installations in Ships and Offshore Structures Sectional Committee, ET 26 FOREWORD This Indian Standard ( Part 2/Set 4 ) was adopted by the Bureau of Indian Standards, draft finalized by Electrical Equipment and Jnstallations in Ships and Offshore Structures Committee had been approved by the Electrotechnical Division Council. This standard ( Part 2/Set 4 ) is one among the series of the This series will have the following parts: installations in ships. Part Part Part Part Part 1 2 3 4 5 General, System design, Equipment, Installation Special and test of completed installations, and Indian Standards on after the Sectional electrical features. taken from steering the IEC Publication gear - specification', 92-204 ( 1987 ) issued by the In preparing this standard, assistance has been `System design - Electric and electrohydraulic International Electrotechnical Commission. This part of I_ `Specification IS 10242 ( Part design, Section the standard shall be read in conjunction with IS 10242 ( Part Z/Set 1 ) : 1982 .* for electrical installations in ships: Part 2 System design, Section I General. 2/Set 2 ) : 1983 `Specification for electrical installations in shi~ps: Part 2 System 2 Protection', and other parts ~mentioned above. of this standard is complied with, a test or analysis, shall be rounded numerical values ( revised 1'. The should be the same as that of the For the purpose of deciding whether a particular requirement the final value, observed or calculated, expressing the result of off in accordance with IS 2 : 1960 `Rules for rounding off number of significant places retained in the rounded off value specified value in this standard. IS ~0242 ( Part Z/Sef 4 ) : 1993 hcJiluz Starzdurd ELECTRICAL Iivs~AtLAT~KNW SPE%TF1CATION PART 2 SYSTEM DESIGN Electric a'nd Electrohydraulic IN SHIPS,Steering Gear Section 1 SCOPE 4 3.6 Steering Gear Control System The equipment by which orders, are transmitted from the navigating bridge to the steering gear pdwer units. Steering gear control systemst comprise transmitters, receivers, I~ydr:iulic control pumps and their associated motors, motor controllers, piping and cables, etc. SECTION,46 4 POWER DESIGN ASPECTS GEAR 1.1 This standard ( Part ~/SW 4 ) is applictible to the main features of electric' and electrohydraulic steering gear for use in ships. 2 REFERENCES 2.1 IS 4722 : 1968 electrical machines' standard. SECTION 3 DEFINITIONS 3.0 For the purpose of this standard, followirjg definitions shall apply. , 3.1 Main Steering Gear the `Specification is a necessary for rotating adjunct to this 4A - DEFINITION OPERA'IXD STFEHlNG 4.1 Electric or electtohydraulic steering gear may be used for the power operated main and auxiJiary steering gear required by SOLAS Rules, IY74 and subsequent amendments. 4.2 The: electrical systems of the main steering gear and auxihary steering gear `shall be so arranged \hat any failure in one of the steering gears will not render inoperative the electiical systems o,f the other steering gear. When an auxiliary sleer,ing, gear is not required by SOLAS,. IY74 and the main steering gear corn-prises .two or more power unit>, the qjectrical system for each power unit shall be so arranged that the failure of one of them will not render the sther units inoperative. , S&TIQN 4C --`bJQTORS ASSOCIATED CONTROL' 5 MOTORS' 5.1 To determine the required characteristics of the electric inotors for power units, the breakaway and maximum working torque of the qteering gear under all operating conditions shall be considered.' The ratib of pull-out torque to rated torque shall be at least 1'6. 5.2 Motors for steering gear power tInits mcy rated for intermittent power demand. The rating shall be detcrrniIlcd the s:eering gear char;lcterrstics d11p. The machinery, rudder actuators, steering gear power units and ancillary equipment and the means of applying torque to the rudder stock ( for example tiller or quadrant ) rjecessary for effecting movement of the rudder for the purpose of steering Ihe ship under ngrrnql seT!ice condit!ons. 3.2 Auxiliary Steering Gear The ecjuipmlnt, other than any part of the -main steering gear, necessary to steer the ship in the event of failure of the main steering gear bllt not including the tiller, quadrant or components serving the same purpose. 3.3 Electric Steering Gear A power operated steering gear where an electric motor applies torque to the rudder stock through mechanic,ll means only. 3.4 Electrohydraulic Sreering Gear AND GEAR A power operate d steering gear where a hydraulic pump driven by an electric motor, applies torque to the rudder stock through hydr-nulic and mechanical means. 3.5 Steering Grar Power Unit gear, an electrical he OII the t)a!91s ~)f (II lhe slib,ccI a) III the case of electric sleering electric mcjtor and its associated equipment. In any case the rating For rnotors units: 53 1 of should be ;It least: gear power b) In the case of electrohydraulic steering gear, ;Ln electric motor and its associated electrical equipment and connected pump. eiectrlc stc'erlrlg 40 percent according to IS 4712 : Ic)OS. IS 10242 ( Part 2/Set 4 ) -: 1993 For motors of electrohydraulic power units and for converters: S6 - steering gear 9 CIRCUIT PROTECTION 25 percent according to IS 4722 : 1968. STARTERS 6 MOTOR 9.1 Short-circuit protection shall be provided for each control circuit and each power circuit of electric or electrohydraulic main and auxiliary steering gear. 9.2 No protection other than short-circuit protection shall be provided for steering gear control system supply circuits. 9.3 Protection against excess current, if provided for power circuits, shall be for not less than twice the full load current of the motor or circuit so protected, and shall be arranged to permit the passage of the appropriate starting currents. SECTION 4E - CONTROLS INDICATIONS AND Each electric motor of a main or auxiliary steering gear power unit shall be provided with its own separate motor starter gear located within the steering gear compartment. Alternatively it is permitted to locate the motor starter gear in the supplying main switchboard or main engine control room, and in the supplying emergency switchboard or emergency switchboard room. SECTION 7 POWER 4D CIRCUIT DESIGN CIRCUITS SUPPLY 7.1 Each electric of electrohydraulic steering gear comprising one or more power units shall, except as otherwise ~permitted by SOLAS Rules, 1974 and subsequent amendments, be served by at least two exclusive circuits, fed directly from the main switchboard, however one of the circuits may be supplied through the emergency switchboard. 7.2 An auxiliary electric or electrohydraulic steering gear associated with a main electric or electrohydraulic steering gear may be connected to one of the circuits supplying the main steering gear. 7.3 The circuits supplying an electric or electrohydraulic steering gear shall have adequate rating for supplying all electric motors and devices which can be simultaneously connected to them and may be required to operate simultaneously. 7.4 For certain ships specified in SOLAS 1974, an alternative power supply from the emergency source of electrical power or from an independent source of power located within the steering gear compartment, is required. This power supply shall be activated cally, within 45 s, in the event of power the main source(s) of electrical power meet the requirements of SOLAS Rules, subsequent amendments. 8 SUPPLY CONTROL OF CONTROL SYSTEMS CIRCUITS automatifailure of and shall 1974 and AND 10 STARTING AND STOPPING OF MOTORS FOR STEERING GEAR POWER UNITS 10.1 Motors for power units shall be capable of being started and stopped from a position on the navigating bridge and from a point within the steering gear compartment. Means shall be provided at the position of the motor starters for isolating any remote controlled starting and stopping devices. 10.2 Main and auxiliary steering gear power units shall be arranged to restart automatically when power is restored after a power failure. 11 STEERING GEAR CONTROL SYSTEMS 11.1 For the main steering gear, control for the steering gear shall be provided both on the navigating bridge and in the steering gear compartment. 11.2 For the power operated auxiliary steering gear, control for steering gear shall be provided in the steering gear compartment and it shall also be operable from the navigating bridge and shall be independent of the control system for the main steering gear. SOLAS with in accordance and subsequent amendments, an auxiliary steering gear is not installed and the main steering gear comprises two or more identical power units, two independent control systems shall be provided, both operable from the navigating bridge and the steering gear compartment. II.3 When, Rules, 1974 8.1 Each control for starting and stopping -of motors for power units shall be served by its own control circuit supplied from its respective power circuit. 8.2 Any electrical main and auxiliary steering gear control system shall be served by it8 own separate circuit supplied from a steering gear power circuit from a point within the steering gear compartment, or directly from switchboard busbars supplying that steering gear power circuit at a point on the switchboard adjacent to the supply to the steering gear power circuit. This does not require duplication wheel or steering lever. of the steering Where the control system includes a hydraulic telemotor, a second independent control system need not be fitted, except where specified in SOLAS Rules, 1974 and subsequent amendments. IS 10242 ( Part Z/Set 4 ) : 1993 11.4 The steering gear control system provided in accordance with 11.1, 11.2 and 11.3 shall be capable of being brought into operation from a position on the navigating bridge. 11.5 Means shall be provided in the steering gear compartment for isolating any steering gear control system operable from the navigating bridge from the steering gear it serves. 12 ALARMS AND INDICATIONS 13 RUDDER ANGLE INDICATION The angular position of the rudder shall be indicated on the navigating bridge and where necessary, it shall be recognizable from all coming positions. The rudder angle indication system shall be independent of the steering gear power and control systems and supplied through the emergency switchboard, or by an alternative independent source of electric power such as that referred to in 7.4. NOTE - The angular position of the rudder should be recognizable, in accordance with SOLAS Rdes, 1974 and subsequent amendments in the steering gear compartment. The indication need not be electrical. 12.1 Means for indicating that the motors of electric and electrohydraulic steering gear are running shall be installed on the navigating bridge and at a suitable main machinery control position. 12.2 Overload alarm shall be provided for motors of power units for all main and auxiliary steering gear. 12.3 Where a three-phase power supply is used, an alarm shall be provided that will indicate failure of any one of the supply phases. 12.4 In the event of a power failure to any one of the steering gear power units, an alarm shall be given. 12.5 In the event power supply to shall be given. of Dower failure of electrical the *control system, an alarm SECTION 14 SEPARATION Duplicated electric steering gear control components shall practicable. 4F - SEPARATION OF CIRCUITS power circuits and their systems with their associated be separated as far as The corresponding cables shall follow different routes which shall be separated both vertically and horizontally, as far as practicable, throughout their entire length. SECTION 46 COMMUNtCATION BETWEEN AND STEERlNG 12.6 A low level alarm for each hydraulic fluid reservoir shall be provided to give the earliest practicable indication of hydraulic fluid leakage. 12.7 The alarms required by 12.2 to 12.6 shall be both audible and visual and shall be located as specified in SOLAS Rules, 1974 and subsequent amendments. 15 COMMUNICATION NAVIGATING BRIDGE GEAR COMPARTMENT A means of communication shall be provided between the navigating bridge and the steering gear compartment. If electrical it shall be fed through the emergency switchboard or it shall be sound powered and it should be housed in an acoustic bridge. Standard Mark The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act. 1986 and the Rules and Regulations made thereunder. 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